package com.sina.common.util;

import android.util.Log;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DecimalFormat;

public class FileSizeUtils {
	
		public static final int SIZETYPE_B = 1;//获取文件大小单位为B的double值
		public static final int SIZETYPE_KB = 2;//获取文件大小单位为KB的double值
		public static final int SIZETYPE_MB = 3;//获取文件大小单位为MB的double值
		public static final int SIZETYPE_GB = 4;//获取文件大小单位为GB的double值
		/**
		* 获取文件指定文件的指定单位的大小
		* @param filePath 文件路径
		* @param sizeType 获取大小的类型1为B、2为KB、3为MB、4为GB
		* @return double值的大小
		*/
		public static double getFileOrFilesSize(String filePath, int sizeType){
		File file=new File(filePath);
		long blockSize=0;
		try {
		if(file.isDirectory()){
		blockSize = getFileSizes(file);
		}else{
		blockSize = getFileSize(file);
		}
		} catch (Exception e) {
		e.printStackTrace();
		Log.e("获取文件大小","获取失败!");
		}
		return FormetFileSize(blockSize, sizeType);
		}
		/**
		* 调用此方法自动计算指定文件或指定文件夹的大小
		* @param filePath 文件路径
		* @return 计算好的带B、KB、MB、GB的字符串
		*/
		public static String getAutoFileOrFilesSize(String filePath){
		File file=new File(filePath);
		long blockSize=0;
		try {
		if(file.isDirectory()){
		blockSize = getFileSizes(file);
		}else{
		blockSize = getFileSize(file);
		}
		} catch (Exception e) {
		e.printStackTrace();
		Log.e("获取文件大小","获取失败!");
		}
		return FormetFileSize(blockSize);
		}
		/**
		* 获取指定文件大小
		* @param f
		* @return
		* @throws Exception
		*/
		private static long getFileSize(File file) throws Exception
		{
		long size = 0;
		 if (file.exists()){
		 FileInputStream fis = null;
		 fis = new FileInputStream(file);
		 size = fis.available();
		 }
		 else{
		 file.createNewFile();
		 Log.e("获取文件大小","文件不存在!");
		 }
		 return size;
		}
		 
		/**
		* 获取指定文件夹
		* @param f
		* @return
		* @throws Exception
		*/
		private static long getFileSizes(File f) throws Exception
		{
		long size = 0;
		File flist[] = f.listFiles();
		for (int i = 0; i < flist.length; i++){
		if (flist[i].isDirectory()){
		size = size + getFileSizes(flist[i]);
		}
		else{
		size =size + getFileSize(flist[i]);
		}
		}
		return size;
		}
		/**
		 * 转换文件大小
		 * @param fileS
		 * @return
		 */
		private static String FormetFileSize(long fileS)
		{
		DecimalFormat df = new DecimalFormat("#.00");
		String fileSizeString = "";
		String wrongSize="0B";
		if(fileS==0){
		return wrongSize;
		}
		if (fileS < 1024){
		fileSizeString = df.format((double) fileS) + "B";
		 }
		else if (fileS < 1048576){
		fileSizeString = df.format((double) fileS / 1024) + "KB";
		}
		else if (fileS < 1073741824){
		    fileSizeString = df.format((double) fileS / 1048576) + "MB";
		  }
		else{
		    fileSizeString = df.format((double) fileS / 1073741824) + "GB";
		  }
		return fileSizeString;
		}
		/**
		 * 转换文件大小,指定转换的类型
		 * @param fileS 
		 * @param sizeType 
		 * @return
		 */
		private static double FormetFileSize(long fileS,int sizeType)
		{
		DecimalFormat df = new DecimalFormat("#.00");
		double fileSizeLong = 0;
		switch (sizeType) {
		case SIZETYPE_B:
		fileSizeLong= Double.valueOf(df.format((double) fileS));
		break;
		case SIZETYPE_KB:
		fileSizeLong= Double.valueOf(df.format((double) fileS / 1024));
		break;
		case SIZETYPE_MB:
		fileSizeLong= Double.valueOf(df.format((double) fileS / 1048576));
		break;
		case SIZETYPE_GB:
		fileSizeLong= Double.valueOf(df.format((double) fileS / 1073741824));
		break;
		default:
		break;
		}
		return fileSizeLong;
		} 
		 public static void copyFile(File sourceFile, File targetFile)
				 throws IOException {
			 
			 if (targetFile.exists()) {
				 targetFile.delete();
			  }
			 
				         // 新建文件输入流并对它进行缓冲   
				         FileInputStream input = new FileInputStream(sourceFile);
				         BufferedInputStream inBuff=new BufferedInputStream(input);
				   
				         // 新建文件输出流并对它进行缓冲   
				         FileOutputStream output = new FileOutputStream(targetFile);
				         BufferedOutputStream outBuff=new BufferedOutputStream(output);
				           
				         // 缓冲数组   
				         byte[] b = new byte[1024 * 5];  
				         int len;  
				         while ((len =inBuff.read(b)) != -1) {  
				             outBuff.write(b, 0, len);  
				         }  
				         // 刷新此缓冲的输出流   
				         outBuff.flush();  
				           
				         //关闭流   
				         inBuff.close();  
				         outBuff.close();  
				         output.close();  
				         input.close();  
				     }  
	  
}
